The study protocol will be submitted to the Research Ethics Committee of the University Hospital for evaluation. All patients included in the study will sign a free and informed consent form. The patients will be assessed according to eligibility criteria and their demographic data (age, gender) and body weight will be recorded at the first visit. They will undergo an interview to assess symptoms and possible disease activity one week before the beginning of the treatment. They will also fill out a questionnaire about quality of life, anxiety and depression and another one about fatigue before and after the treatment. Only patients who have completed the 8-week treatment will be included in the study.